Alfred does not have a mobile application that can make snippets available from your desktop to your phone. Here’s how to use Shortcuts on iOS to do that.
First, export your snippets in Alfred by going to Features -> Snippets -> right click the collection and select Export and save the file to Dropbox.
Next, create a shortcut on your phone with the following.
(Not pictured in the screenshot, add a step to copy the value to your clipboard or do something else with the value)
Now when you run the shortcut, you’ll be able access your snippets on your phone.
Make sure to replace the file path with the path to your snippets file stored in Dropbox. This also works if you store the file someplace else because the file that Alfred stores for snippets is a zipped json file.